@Vincent,
Thanks :-) OS3.5 had no problem with this new drive's capacity. I suspect that your 64-bit filesystem support is not working properly, maybe.
Anyhow, I partitioned and formatted it from the emergency boot disk then used winuae to copy all my existing drive's tata to the new one (I only have a single IDE hard drive in my amiga and no adaptor to fit more). It all worked fine.
As for SFS, my exisitng partition structure will allow me to experiment in relative safety. I can back up anything important before I mess around.
A bit OT, This newer drive is UDMA capable. Does anybody know if one of those SCSI->IDE bridge adapters will allow my blizzppc to do DMA transfers with it? That would be way nice :-)